What I do, as soon as the cop starts telling me what I did wrong. (or asking me if I know what I did, to which I of course I answer No!)
I make it as if I am getting a lecture, I ask all sort of questions like, wow, I always thought that it was permitted to turn on red if I am in the intersection.. (just make sure not to admit the violation)
I got pulled twice, Once it helped (just had to listen to a lengthy driving course. the other time the trooper smiled and said here you go and there was the ticket..